Abstract

Hard ferromagnetic behavior is reported for crystalline produced by melt-spinning. For the highest-performing material, remanent magnetization, intrinsic coercive field, and maximum energy product at room temperature are 6.2 kG, 4.5 kOe, and 6.7 MGOe, respectively. This is the highest reported energy product for this class of alloys, and is about half that of optimized ribbons. The Curie temperature of both crystalline and amorphous is near 770 K. The results suggest further optimization of magnetic properties should be attainable, and indicate to be a promising material for rare-earth-free permanent magnets.

Received 05 October 2012Accepted 23 October 2012Published online 12 November 2012

Acknowledgments:

We thank Cecil A. Carmichael for use of and assistance with the melt-spinner. Research sponsored by the U.S. Department of Energy, Energy Efficiency and Renewable Energy, Office of Vehicle Technologies, as part of the Propulsion Materials Program (M.A.M, N.J.G., and O.R.). Microscopy work supported by ORNL SHaRE, Division of Scientific User Facilities, Office of Basic Energy Sciences, U. S. Department of Energy. High temperature magnetization measurements at The University of Tennessee (M.K.) supported by DOD DEPSCoR Grant No. N00014-08-1-0783.

[Magnets or magnetic bodies characterised by the
magnetic materials therefor; Selection of materials for their magnetic
properties, Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties]